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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Middle English unclere, equivalent to un- + clear. Compare Saterland Frisian uunkloor (“unclear”), West Frisian ûnklear (“inoperative, broken”), Dutch onklaar (“out of order, defective, broken”), German unklar (“unclear”), Danish uklar (“unclear”), Swedish oklar (“unclear”).
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Classic usage
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